Sigmund's birthday surprise

The birds were singing and the early morning sunshine was glinting through the trees as Mr Periwinkle the mailman came driving along the lane in his mail van. Normally, Mr Periwinkle did his rounds on his bicycle but this morning he had an especially large birthday present to deliver to Sigmund Swamp. It was a long wooden crate, and rather strange snorting noises were coming out of it!